Clouds appear white because of an optical process called Mie scattering. When sunlight enters a cloud, it hits millions of tiny water droplets suspended in the air. These water droplets are much larger than individual gas molecules in our atmosphere. Because of their size, they scatter all the different wavelengths of visible light equally. When all colors of light blend together again, our eyes perceive the mixture as white light. However, clouds constantly shift in color based on their thickness and the sun's position. At sunrise or sunset, sunlight travels through a much thicker layer of the Earth's atmosphere. This filters out shorter blue wavelengths, leaving only beautiful reds, oranges, and pinks to reflect off the water droplets. Storm clouds appear dark gray because they become packed with dense water droplets that absorb light instead of scattering it. The sky's shifting hues mirror the dynamic journey of light as it interacts with nature.